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16 papers · 1 filter
Kinks of open superstring field theory
Gianluca Calcagni, Giuseppe Nardelli
We construct approximate kink solutions of supersymmetric open string field theory at lowest level when non-local operators in the tachyon effective action are fully taken into acc…
Cosmology of the Lifshitz universe
Gianluca Calcagni
We study the ultraviolet complete non-relativistic theory recently proposed by Horava. After introducing a Lifshitz scalar for a general background, we analyze the cosmology of the…
UV finiteness of Pohlmeyer-reduced form of the AdS_5xS^5 superstring theory
R. Roiban, A. A. Tseytlin
We consider the Pohlmeyer-type reduced theory found by explicitly solving the Virasoro constraints in the formulation of AdS_5xS^5 superstring in terms of supercoset currents. The…
Inflation with a Negative Cosmological Constant
Tirthabir Biswas, Anupam Mazumdar
We find a unique way of realizing inflation through cyclic phases in an universe with negative vacuum energy. According to the second law of thermodynamics entropy monotonically in…
Cyclic Inflation
Tirthabir Biswas, Stephon Alexander
We present an inflationary model that is geodesically complete and does not suffer from the transplanckian problem. In most inflationary models, massless (conformal) scalar field f…
Stable de Sitter Vacua in 4 Dimensional Supergravity Originating from 5 Dimensions
O. Ogetbil
The five dimensional stable de Sitter ground states in N=2 supergravity obtained by gauging SO(1,1) symmetry of the real symmetric scalar manifold (in particular a generic Jordan f…